git-reset.sh

   1 #!/bin/sh
   2
   3 USAGE='[--mixed | --soft | --hard]  [<commit-ish>]'
   4 . git-sh-setup
   5
   6 tmp=${GIT_DIR}/reset.$$
   7 trap 'rm -f $tmp-*' 0 1 2 3 15
   8
   9 update=
  10 reset_type=--mixed
  11 case "$1" in
  12 --mixed | --soft | --hard)
  13         reset_type="$1"
  14         shift
  15         ;;
  16 -*)
  17         usage ;;
  18 esac
  19
  20 case $# in
  21 0) rev=HEAD ;;
  22 1) rev=$(git-rev-parse --verify "$1") || exit ;;
  23 *) usage ;;
  24 esac
  25 rev=$(git-rev-parse --verify $rev^0) || exit
  26
  27 # We need to remember the set of paths that _could_ be left
  28 # behind before a hard reset, so that we can remove them.
  29 if test "$reset_type" = "--hard"
  30 then
  31         update=-u
  32 fi
  33
  34 # Soft reset does not touch the index file nor the working tree
  35 # at all, but requires them in a good order.  Other resets reset
  36 # the index file to the tree object we are switching to.
  37 if test "$reset_type" = "--soft"
  38 then
  39         if test -f "$GIT_DIR/MERGE_HEAD" ||
  40            test "" != "$(git-ls-files --unmerged)"
  41         then
  42                 die "Cannot do a soft reset in the middle of a merge."
  43         fi
  44 else
  45         git-read-tree --reset $update "$rev" || exit
  46 fi
  47
  48 # Any resets update HEAD to the head being switched to.
  49 if orig=$(git-rev-parse --verify HEAD 2>/dev/null)
  50 then
  51         echo "$orig" >"$GIT_DIR/ORIG_HEAD"
  52 else
  53         rm -f "$GIT_DIR/ORIG_HEAD"
  54 fi
  55 git-update-ref -m "reset $reset_type $@" HEAD "$rev"
  56
  57 case "$reset_type" in
  58 --hard )
  59         ;; # Nothing else to do
  60 --soft )
  61         ;; # Nothing else to do
  62 --mixed )
  63         # Report what has not been updated.
  64         git-update-index --refresh
  65         ;;
  66 esac
  67
  68 rm -f "$GIT_DIR/MERGE_HEAD" "$GIT_DIR/rr-cache/MERGE_RR" "$GIT_DIR/SQUASH_MSG"